Exhaust silencer



J, ERNs-r EXHAUST S ILENCER 'Filed Jan. 24. 1925 Patented oct. 1s, 1927.

PATENT OFFICE.

JOHANNES ERNST, OF BAD SALZFLEN, VGEIRIVIANY, ASSIGNOR TO JOSEF ERNST, 0F

BAD SALZUFLEN, GERMANY. i

EXHAUST SILENCER.

Application led January 24, 1925, Serial No. 4,593, and' in Germany October 30, 1924.

Exhaust silencers having a helix for guidl ing the path of the exhaust therethrough a1- ranged 1n they exhaust pipe or in the casing attached thereto, are already known.

i" rIhe present invention relates to an improved exhaust silencer in which the casing itself is shaped like a helix whereby a spiral cavity is formed therein of which the outer walls are in contact with the atmosphere.

) The improved exhaust silencer is 'represented on the accompanying drawings, in which: Fig. 1 is a longitudinal central section on the line A-B of Fig. 2, which is a plan view of the same, Figs. 3, 4 and 5 show- 5 ingv cross-sections respectively on the lines C-D, E--F and G-H of Fig. 2. The exhaust silencer comprises two cast or punched similar halves I and II forming together a helical bo'dy a enclosing a spiral cavity b and D tapered toward its outlet end, while flanges c and d on said two halves serve to connect same immovably with one another; the inlet end of the apparatus forming a cylindrical chamber e having a flange m for its attachi ment t the exhaust pipe, while the outlet end of the apparatus forms a cylindrical channel 7 having its front face obliquely cut off and adjoining the helical body7 by means of a vbulbg. At both sides of the spiral a threads of the helical body, long gitudinal channels t' are formed by means of bulbs h on the flanges c, d and lead through said threads while being in communication therewith, said channels connecting the inlet endl 5 e with the outlet end f.; the spiral exhaust current flowing through the exhaust silencer being thus accompanled at both sides by a longitudinally directed current, whereby a complete silencing of the exhaust and a uni- 0 form and shockfree discharge of the latter is attained. The joining of the bulb g at the outlet end f with the helical bod a isv eiected by means of a narrow inwar ly tapered central channel c, so that beside the spiral current and the two lateral longitudinally directed currents a third axially directed current of the exhaust is created, which currents are combined at this narrowing lc and enter thus together the outlet endi f, the outlet speed of the current being thereby reduced to a minimum.

' The advantages of the improved exhaust y silencer lie in the fact that by the casing itseli` a perfect silencing' of the exhaust takes place, while furthermore owing to the casing 65 being made of two similar halves one mould or punch only is required for its manufacture. Besides, a perfect cooling is attained by the outer walls of the spiral threads having a large contact surface with the atmosphere.4

1. An exhaust silencer comprising a body provided with hollow helical threads and having open cylindrical inlet and outlet ends, said body being tapered-toward its outlet end and formed of two similar halves having lateral connection flanges thereon, the front face of said outlet end being obliquely cut AIOR, the lateral connection flanges of said two similar halves forming between them longitudinal channels leading through the threads of said body and connecting said inlet and outlet ends.

2. In'an exhaust silencer as specified in 75 claim 1, a narrow inwardly tapered connection channel between the threads andthe outlet end of said body.v

In testimony whereof my hand.

I have hereunto set JOHANNES ERNST. 

